7003-081 N.S.H. CO. Diamond Edge butt gauge. Nickel plated base with sliding rosewood top that is locked with a knurled thumbscrew on the top. Diamond shaped mark says "N.S.H. Co. St. Louis, Diamond Edge" with the DE arrow inside it. This is likely a Norvell-Shapleigh Hardware Company product, which was the name of Shapleigh Hardware from 1901-1918. Super clean and looks never used, you would never know it's over 100 years old by looking at it. Fine 40-80 (RRT898)